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/*
* Copyright (C) 2009 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License (not later!)
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses>
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/blktrace_api.h>
#include "trace-cmd.h"
#define MINORBITS 20
#define MINORMASK ((1U << MINORBITS) - 1)
#define MAJOR(dev) ((unsigned int) ((dev) >> MINORBITS))
#define MINOR(dev) ((unsigned int) ((dev) & MINORMASK))
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
struct blk_data {
unsigned long long sector;
struct event_format *event;
unsigned int action;
unsigned int pid;
unsigned int device;
unsigned int bytes;
unsigned int error;
void *pdu_data;
unsigned short pdu_len;
};
static void fill_rwbs(char *rwbs, int action, unsigned int bytes)
{
int i = 0;
int tc = action >> BLK_TC_SHIFT;
if (action == BLK_TN_MESSAGE) {
rwbs[i++] = 'N';
goto out;
}
#if defined(HAVE_BLK_TC_FLUSH)
if (tc & BLK_TC_FLUSH)
rwbs[i++] = 'F';
#endif
if (tc & BLK_TC_DISCARD)
rwbs[i++] = 'D';
else if (tc & BLK_TC_WRITE)
rwbs[i++] = 'W';
else if (bytes)
rwbs[i++] = 'R';
else
rwbs[i++] = 'N';
#if defined(HAVE_BLK_TC_FLUSH)
if (tc & BLK_TC_FUA)
rwbs[i++] = 'F';
#endif
if (tc & BLK_TC_AHEAD)
rwbs[i++] = 'A';
#if !defined(HAVE_BLK_TC_FLUSH)
if (tc & BLK_TC_BARRIER)
rwbs[i++] = 'B';
#endif
if (tc & BLK_TC_SYNC)
rwbs[i++] = 'S';
if (tc & BLK_TC_META)
rwbs[i++] = 'M';
out:
rwbs[i] = '\0';
}
static int log_action(struct trace_seq *s, struct blk_data *data,
const char *act)
{
char rwbs[6];
fill_rwbs(rwbs, data->action, data->bytes);
return trace_seq_printf(s, "%3d,%-3d %2s %3s ",
MAJOR(data->device),
MINOR(data->device), act, rwbs);
}
static void blk_log_msg(struct trace_seq *s, void *data, int len)
{
trace_seq_printf(s, "%.*s", len, (char *)data);
}
static int blk_log_dump_pdu(struct trace_seq *s, const unsigned char *pdu_buf,
int pdu_len)
{
int i, end, ret;
if (!pdu_len)
return 1;
/* find the last zero that needs to be printed */
for (end = pdu_len - 1; end >= 0; end--)
if (pdu_buf[end])
break;
end++;
if (!trace_seq_putc(s, '('))
return 0;
for (i = 0; i < pdu_len; i++) {
ret = trace_seq_printf(s, "%s%02x",
i == 0 ? "" : " ", pdu_buf[i]);
if (!ret)
return ret;
/*
* stop when the rest is just zeroes and indicate so
* with a ".." appended
*/
if (i == end && end != pdu_len - 1)
return trace_seq_puts(s, " ..) ");
}
return trace_seq_puts(s, ") ");
}
static unsigned int t_sec(int bytes)
{
return bytes >> 9;
}
static unsigned int be32_to_cpu(unsigned int val)
{
unsigned int swap;
if (tracecmd_host_bigendian())
return val;
swap = ((val & 0xffULL) << 24) |
((val & (0xffULL << 8)) << 8) |
((val & (0xffULL << 16)) >> 8) |
((val & (0xffULL << 24)) >> 24);
return swap;
}
static unsigned long long be64_to_cpu(unsigned long long val)
{
unsigned long long swap;
if (tracecmd_host_bigendian())
return val;
swap = ((val & 0xffULL) << 56) |
((val & (0xffULL << 8)) << 40) |
((val & (0xffULL << 16)) << 24) |
((val & (0xffULL << 24)) << 8) |
((val & (0xffULL << 32)) >> 8) |
((val & (0xffULL << 40)) >> 24) |
((val & (0xffULL << 48)) >> 40) |
((val & (0xffULL << 56)) >> 56);
return swap;
}
static unsigned long long get_pdu_int(void *data)
{
const unsigned long long *val = data;
return be64_to_cpu(*val);
}
static void get_pdu_remap(void *pdu_data,
struct blk_io_trace_remap *r)
{
const struct blk_io_trace_remap *__r = pdu_data;
unsigned long long sector_from = __r->sector_from;
r->device_from = be32_to_cpu(__r->device_from);
r->device_to = be32_to_cpu(__r->device_to);
r->sector_from = be64_to_cpu(sector_from);
}
static int blk_log_remap(struct trace_seq *s, struct blk_data *data)
{
struct blk_io_trace_remap r = { .device_from = 0, };
get_pdu_remap(data->pdu_data, &r);
return trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n",
data->sector, t_sec(data->bytes),
MAJOR(r.device_from), MINOR(r.device_from),
(unsigned long long)r.sector_from);
}
static int blk_log_split(struct trace_seq *s, struct blk_data *data)
{
const char *cmd;
cmd = pevent_data_comm_from_pid(data->event->pevent, data->pid);
return trace_seq_printf(s, "%llu / %llu [%s]\n", data->sector,
get_pdu_int(data->pdu_data), cmd);
}
static int blk_log_plug(struct trace_seq *s, struct blk_data *data)
{
const char *cmd;
cmd = pevent_data_comm_from_pid(data->event->pevent, data->pid);
return trace_seq_printf(s, "[%s]\n", cmd);
}
static int blk_log_unplug(struct trace_seq *s, struct blk_data *data)
{
const char *cmd;
cmd = pevent_data_comm_from_pid(data->event->pevent, data->pid);
return trace_seq_printf(s, "[%s] %llu\n", cmd, get_pdu_int(data->pdu_data));
}
static int blk_log_with_error(struct trace_seq *s, struct blk_data *data)
{
if (data->action & BLK_TC_ACT(BLK_TC_PC)) {
blk_log_dump_pdu(s, data->pdu_data, data->pdu_len);
trace_seq_printf(s, "[%d]\n", data->error);
return 0;
} else {
if (t_sec(data->bytes))
return trace_seq_printf(s, "%llu + %u [%d]\n",
data->sector,
t_sec(data->bytes),
data->error);
return trace_seq_printf(s, "%llu [%d]\n",
data->sector, data->error);
}
}
static int blk_log_generic(struct trace_seq *s, struct blk_data *data)
{
const char *cmd;
cmd = pevent_data_comm_from_pid(data->event->pevent, data->pid);
if (data->action & BLK_TC_ACT(BLK_TC_PC)) {
int ret;
ret = trace_seq_printf(s, "%u ", data->bytes);
if (!ret)
return 0;
ret = blk_log_dump_pdu(s, data->pdu_data, data->pdu_len);
if (!ret)
return 0;
return trace_seq_printf(s, "[%s]\n", cmd);
} else {
if (t_sec(data->bytes))
return trace_seq_printf(s, "%llu + %u [%s]\n",
data->sector,
t_sec(data->bytes), cmd);
return trace_seq_printf(s, "[%s]\n", cmd);
}
}
static const struct {
const char *act[2];
int (*print)(struct trace_seq *s, struct blk_data *data);
} what2act[] = {
[__BLK_TA_QUEUE] = {{ "Q", "queue" }, blk_log_generic },
[__BLK_TA_BACKMERGE] = {{ "M", "backmerge" }, blk_log_generic },
[__BLK_TA_FRONTMERGE] = {{ "F", "frontmerge" }, blk_log_generic },
[__BLK_TA_GETRQ] = {{ "G", "getrq" }, blk_log_generic },
[__BLK_TA_SLEEPRQ] = {{ "S", "sleeprq" }, blk_log_generic },
[__BLK_TA_REQUEUE] = {{ "R", "requeue" }, blk_log_with_error },
[__BLK_TA_ISSUE] = {{ "D", "issue" }, blk_log_generic },
[__BLK_TA_COMPLETE] = {{ "C", "complete" }, blk_log_with_error },
[__BLK_TA_PLUG] = {{ "P", "plug" }, blk_log_plug },
[__BLK_TA_UNPLUG_IO] = {{ "U", "unplug_io" }, blk_log_unplug },
[__BLK_TA_UNPLUG_TIMER] = {{ "UT", "unplug_timer" }, blk_log_unplug },
[__BLK_TA_INSERT] = {{ "I", "insert" }, blk_log_generic },
[__BLK_TA_SPLIT] = {{ "X", "split" }, blk_log_split },
[__BLK_TA_BOUNCE] = {{ "B", "bounce" }, blk_log_generic },
[__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap },
};
static int blktrace_handler(struct trace_seq *s, struct pevent_record *record,
struct event_format *event, void *context)
{
struct format_field *field;
unsigned long long val;
void *data = record->data;
struct blk_data blk_data;
unsigned short what;
int long_act = 0;
field = pevent_find_field(event, "action");
if (!field)
return 1;
if (pevent_read_number_field(field, data, &val))
return 1;
blk_data.action = val;
field = pevent_find_field(event, "bytes");
if (!field)
return 1;
if (pevent_read_number_field(field, data, &val))
return 1;
blk_data.bytes = val;
field = pevent_find_field(event, "device");
if (!field)
return 1;
if (pevent_read_number_field(field, data, &val))
return 1;
blk_data.device = val;
field = pevent_find_field(event, "pdu_len");
if (!field)
return 1;
if (pevent_read_number_field(field, data, &val))
return 1;
blk_data.pdu_len = val;
field = pevent_find_field(event, "data");
if (!field)
return 1;
blk_data.pdu_data = data + field->offset;
field = pevent_find_field(event, "sector");
if (!field)
return 1;
if (pevent_read_number_field(field, data, &blk_data.sector))
return 1;
field = pevent_find_field(event, "pid");
if (!field)
return 1;
if (pevent_read_number_field(field, data, &val))
return 1;
blk_data.pid = val;
field = pevent_find_field(event, "error");
if (!field)
return 1;
if (pevent_read_number_field(field, data, &val))
return 1;
blk_data.error = val;
blk_data.event = event;
what = blk_data.action & ((1 << BLK_TC_SHIFT) - 1);
if (blk_data.action == BLK_TN_MESSAGE) {
log_action(s, &blk_data, "m");
blk_log_msg(s, blk_data.pdu_data, blk_data.pdu_len);
goto out;
}
if (what == 0 || what >= ARRAY_SIZE(what2act))
trace_seq_printf(s, "Unknown action %x\n", what);
else {
log_action(s, &blk_data, what2act[what].act[long_act]);
what2act[what].print(s, &blk_data);
}
out:
return 0;
}
int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
{
pevent_register_event_handler(pevent, -1, "ftrace", "blktrace",
blktrace_handler, NULL);
return 0;
}
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